Refers to actual physical spaces, mainly tight or enclosed areas where movement is limited. During the cave tour, his claustrophobia became unbearable.
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Trigger Variability
It's important to note that what triggers claustrophobia can be very different for each person. Small rooms don't bother her, but crowds trigger her claustrophobia.
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Metaphorical Use
Sometimes used metaphorically to describe situations that feel restricting or suffocating. He felt a sense of claustrophobia in his desk job.